Prism-based Broadband Optical Cavity (400 – 1600 nm) for High-Sensitivity Trace Gas Sensing by Cavity Enhanced Absorption Spectroscopy

<p>The use of high reflectivity dielectric mirrors to form a high finesse optical cavity allows one to achieve long optical path lengths of up to several kilometres for high-sensitivity spectroscopy applications [1]. However, the high reflectivity of a dielectric mirror is achieved via constructive interference of the Fresnel reflection at the interfaces produced by multilayer coatings of alternate high and low refractive index materials. This wavelength-dependent coating limits the bandwidth of the mirror's high reflectivity to only a few percent of the designed central wavelength [2].</p> <p>In this paper, we report on the development of a novel optical cavity based on prism used as cavity reflector through total internal reflection combined with Brewster angle incidence [3], which offers a high-finesse optical cavity operating in a broadband wavelength region from 400 to longer than 1600 nm. Cavity Enhanced Absorption Spectroscopy (CEAS) of NO<sub>2</sub>, NO<sub>3</sub>, and H<sub>2</sub>O vapor was applied to determine the achieved prism reflectivity over a broad spectral range from 400 nm to 1600 nm.</p> <p>Experimental details and preliminary results will be presented. The developed prism-based cavity is specifically adapted for the needs of broadband measurement of multi-molecular absorber or/and wavelength-dependent extinction coefficient of aerosols over a broad spectral region.</p> <p>Acknowledgments. This work is supported by the French national research agency (ANR) under the CaPPA (ANR-10-LABX-005), the MABCaM (ANR-16-CE04-0009) and the MULTIPAS (ANR-16-CE04-0012) contracts. The authors thank the financial support from the CPER CLIMIBIO program.</p> <p>REFERENCES</p> <p>[1] S. S. Brown, "Absorption spectroscopy in high-finesse cavities for atmospheric studies", Chem. Rev. <strong>103</strong> (2003) 5219-5238.</p> <p>[2] G.R. Fowles, Introduction to Modern Optics, 2nd ed. (Rinehart and Winston, 1975), p. 328.</p> <p>[3] B. Lee, K. Lehmann, J. Taylor and A. Yalin, "A high-finesse broadband optical cavity using calcium fluoride prism retroreflectors", Opt. Express <strong>2</strong><strong>2</strong> (2014) 11583-11591.</p>

CHALCOGEN-BONDED TETRAFLUORO-1,3-DITHIETANE WATER COMPLEX: WHAT DOES IT TAKE TO INVERT THE WATER?

Shape and non-bonding interactions in the formic acid-difluoromethane complex by rotational spectroscopy

Structure and non-covalent interactions of 1,3-difluoropropane and its complex with water explored by rotational spectroscopy and quantum chemical calculations

Rotational spectrum, internal dynamics, and molecular structure of methylphenylsilane

Tetrel bonds and conformational equilibria in the formamide–CO2 complex: a rotational study

Rotational studies point out that two isomers of the formamide–CO2 complex are stabilized by the dominated C⋯O tetrel bond.

Microwave spectrum and non-covalent interactions of the 1, 2, 3, 4-tetrafluorobenzene-water complex

The Barrier to Proton Transfer in the Dimer of Formic Acid: A Pure Rotational Study

Rotational spectrum of 2,2,2-trifluoroacetophenone

Structure, Conformational Equilibria, and Weak Hydrogen Bonding in the CH2 F2 −CF3 CH2 F Dimer

Rotational study on the van der Waals complex 1-chloro-1,1-difluoroethane-argon

HETERO-OLIGOMERS OF DIFLUOROMETHANE AND 1,1-DIFLUOROETHANE: CONFORMATIONAL EQUILIBRIA, MOLECULAR STRUCTURE AND WEAK HYDROGEN BONDS

OH-π HYDROGEN BOND IN THE COMPLEX OF STYRENE-WATER: A ROTATIONAL STUDY

FLUORINATION EFFECT ON HYDROGEN BOND TOPOLOGIES IN WATER ADDUCTS OF FLUOROPYRIDINES

STRUCTURE DETERMINATION, CONFORMATIONAL EQUILIBRIA AND WEAK HYDROGEN BONDS IN HETERODIMERS OF FREONS: THE ROTATIONAL STUDY OF CH2F2-CF3CH2F

Rotational study of the bimolecule acetic acid-fluoroacetic acid

PURE ROTATIONAL SPECTRUM OF THE "NON-POLAR" DIMER OF FORMIC ACID

Interactions between Ketones and Alcohols: Rotational Spectrum and Internal Dynamics of the Acetone-Ethanol Complex

A HIGHLY-INTEGRATED SUPERSONIC-JET FOURIER TRANSFORM MICROWAVE SPECTROMETER

Pulsed jet Fourier transform microwave spectroscopy of the BF 3 -CO complex

Weak Hydrogen Bond Network: A Rotational Study of 1,1,1,2-Tetrafluoroethane Dimer

Probing the Lone Pair···π-Hole Interaction in Perfluorinated Heteroaromatic Rings: The Rotational Spectrum of Pentafluoropyridine·Water

On the Cl⋯C halogen bond: a rotational study of CF3Cl–CO

A Cl⋯C halogen bond links CF3Cl to CO in their symmetric top 1 : 1 adduct.

Rotational Study of Dimethyl Ether–Chlorotrifluoroethylene: Lone Pair···π Interaction Links the Two Subunits

Interactions between Carboxylic Acids and Heteroaromatics: A Rotational Study of Formic Acid–Pyridine

Chloromethane-Water Adduct: Rotational Spectrum, Weak Hydrogen Bonds, and Internal Dynamics

N lone-pair⋯π interaction: a rotational study of chlorotrifluoroethylene⋯ammonia

NH3 forms an adduct with C2F3Cl through a (N)lone pair⋯π interaction.

Average orientation of water in CH2F2⋯H2O from the 17O quadrupole effects in the rotational spectrum of CH2F2⋯H217O

THE ROTATIONAL SPECTRUM OF PYRIDINE-FORMIC ACID

Weak hydrogen bonds in adducts between freons: the rotational study of CH2F2–CH2ClF

The network of weak hydrogen bonds in CH2F2–CH2ClF suggests C–H⋯Cl–C to be preferred to C–H⋯F–C.

Adducts of alcohols with ketones: A rotational study of the molecular complex Ethylalcohol–Cyclobutanone

Competition between weak hydrogen bonds: C–H⋯Cl is preferred to C–H⋯F in CH2ClF–H2CO, as revealed by rotational spectroscopy

CH2O is linked to CH2ClF through a C–H⋯Cl weak hydrogen bond, and it rotates along its symmetry axis with a barrier V2 ∼ 125 cm−1.

Effective orientation of water in 1,4-dioxane···water: the rotational spectrum of the H217O isotopologue

Interactions between Carboxylic Acids and Aldehydes: A Rotational Study of HCOOH–CH2O

Interactions between Freons: A Rotational Study of CH2F2-CH2Cl2

Interactions between freons and aromatic molecules: The rotational spectrum of pyridine–difluoromethane

Interactions between alkanes and aromatic molecules: a rotational study of pyridine–methane

In its complex with pyridine methane behaves like a rare gas: it can be labeled as “pseudo” rare gas.

Weak C–H⋯N and C–H⋯F hydrogen bonds and internal rotation in pyridine–CH3F

Halogen Bond and Free Internal Rotation: The Microwave Spectrum of CF3Cl–Dimethyl Ether

Interaction between Freons and Amines: The C–H···N Weak Hydrogen Bond in Quinuclidine–Trifluoromethane

How Water Interacts with Halogenated Anesthetics: The Rotational Spectrum of Isoflurane-Water

The shape of trifluoromethoxybenzene

The rotational spectrum of formic acid⋯fluoroacetic acid

Halogen–Halogen Links and Internal Dynamics in Adducts of Freons

Conformers of dimers of carboxylic acids in the gas phase: A rotational study of difluoroacetic acid–formic acid

Conformational Equilibria and Large-Amplitude Motions in Dimers of Carboxylic Acids: Rotational Spectrum of Acetic Acid-Difluoroacetic Acid

NON COVALENT INTERACTIONS AND INTERNAL DYNAMICS IN ADDUCTS OF FREONS

Rotational Study of cis- and trans-Acrylic Acid–Trifluoroacetic Acid

Ubbelohde Effect within Weak C–H···π Hydrogen Bonds: The Rotational Spectrum of Benzene–DCF3

Conformational Equilibria in Bimolecules of Carboxylic Acids: A Rotational Study of Fluoroacetic Acid–Acrylic Acid

Conformational equilibria in carboxylic acid bimolecules: a rotational study of acrylic acid–formic acid

Conformational analysis of 1,4-butanediol: A microwave spectroscopy study

Lone-Pair⋅⋅⋅π Interaction: A Rotational Study of the Chlorotrifluoroethylene-Water Adduct

Non-bonding interactions and internal dynamics in CH2F2⋯H2CO: a rotational and model calculations study

Frontiers in Rotational Spectroscopy: Shapes and Tunneling Dynamics of the Four Conformers of the Acrylic Acid-Difluoroacetic Acid Adduct

Effects of ring fluorination on the transient atropisomerism of benzyl alcohol: the rotational spectrum of 3,4-difluorobenzyl alcohol

Orientation of the water moiety in CF4–H2O

Rotational spectrum of 2,5-difluorobenzyl alcohol

Rotational Spectrum and Internal Dynamics of Tetrahydrofuran-Krypton